Cabibbo angle and CP violation in a gauge model with discrete symmetry

1979 ◽  
Vol 24 (12) ◽  
pp. 443-448 ◽  
Author(s):  
M. D’Anna ◽  
A. Masiero
Keyword(s):  
Cp Violation ◽  
Discrete Symmetry ◽  
Cabibbo Angle ◽  
Gauge Model

scholarly journals Minimal scoto-seesaw mechanism with spontaneous CP violation

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
D. M. Barreiros ◽  
F. R. Joaquim ◽  
R. Srivastava ◽  
J. W. F. Valle
Keyword(s):  
Dark Matter ◽  
Cp Violation ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Discrete Symmetry ◽  
Double Beta Decay ◽  
Neutrino Masses ◽  
Seesaw Mechanism ◽  
Cosmological Observations ◽  
Scalar Singlet

Abstract We propose simple scoto-seesaw models to account for dark matter and neutrino masses with spontaneous CP violation. This is achieved with a single horizontal $$ {\mathcal{Z}}_8 $$ Z 8 discrete symmetry, broken to a residual $$ {\mathcal{Z}}_2 $$ Z 2 subgroup responsible for stabilizing dark matter. CP is broken spontaneously via the complex vacuum expectation value of a scalar singlet, inducing leptonic CP-violating effects. We find that the imposed $$ {\mathcal{Z}}_8 $$ Z 8 symmetry pushes the values of the Dirac CP phase and the lightest neutrino mass to ranges already probed by ongoing experiments, so that normal-ordered neutrino masses can be cornered by cosmological observations and neutrinoless double beta decay experiments.

scholarly journals QUARK MASS HIERARCHY AND CP VIOLATION IN LOW ENERGY SUPERSYMMETRY

1996 ◽  
Vol 11 (23) ◽  
pp. 4307-4319 ◽  
Author(s):  
CHUN LIU
Keyword(s):  
Cp Violation ◽  
Quark Mass ◽  
Neutral Current ◽  
Vacuum Expectation ◽  
Discrete Symmetry ◽  
Low Energy ◽  
Tree Level ◽  
Mass Hierarchy ◽  
Family Symmetry ◽  
Flavor Changing

A pattern of quark mass hierarchy and CP violation within the framework of low energy supersymmetry is described. By assuming some discrete symmetry among the three families, the quarks of the third family obtain masses at tree level. The second family obtains masses radiatively at one-loop level due to the soft breaking of the family symmetry. At this level, the first family remains massless by some degeneracy conditions of the squarks. As a result of R parity violation, the sneutrino vacuum expectation values are nonvanishing. CP violation occurs through the superweak sneutrino exchange. This picture is consistent with the experiments on the flavor-changing neutral current.

SPONTANEOUS CP VIOLATION IN A TWO-GENERATION LEFT-RIGHT SYMMETRIC MODEL WITH TWO HIGGS BI-DOUBLETS

1992 ◽  
Vol 07 (34) ◽  
pp. 3179-3186 ◽  
Author(s):  
AMBAR GHOSAL ◽  
ASIM K. RAY ◽  
SASWATI SARKAR
Keyword(s):  
Cp Violation ◽  
Relative Phase ◽  
Vacuum Expectation ◽  
Discrete Symmetry ◽  
Tree Level ◽  
Model Parameters ◽  
Symmetric Model ◽  
Expectation Values ◽  
Flavor Changing ◽  
Experimental Values

We discuss a two-generation left-right symmetric model with two Higgs bi-doublets and a discrete symmetry to show that spontaneous CP violation arises as a result of soft breaking of the discrete symmetry. The contributions to the CP violation parameter ε in the [Formula: see text] transition come from the box diagrams due to WL-WR exchanges as well as from the mixing of the real and imaginary parts of the flavor changing neutral Higgs at the tree level and both contributions depend on the relative phase difference between the vacuum expectation values (vevs) of the relevant neutral Higgs scalars. Other CP violating effects in the model are consistent with their experimental values for the appropriate choice of the model parameters. The extension of the model to the realistic case of three generations of fermions does not appreciably change the phenomenology of the model.

CP violation and the Cabibbo angle

1980 ◽  
Vol 55 (1) ◽  
pp. 1-10 ◽  
Author(s):  
J. Chakrabarti
Keyword(s):  
Cp Violation ◽  
Cabibbo Angle

scholarly journals Cabibbo current and CP violation in a six quark gauge model

1978 ◽  
Vol 76 (5) ◽  
pp. 602-604 ◽  
Author(s):  
T. Hagiwara ◽  
T. Kitazoe ◽  
G.B. Mainland ◽  
K. Tanaka
Keyword(s):  
Cp Violation ◽  
Gauge Model

A SUPERSYMMETRIC 3-4-1 MODEL

2007 ◽  
Vol 22 (32) ◽  
pp. 6147-6167 ◽  
Author(s):  
M. C. RODRIGUEZ
Keyword(s):  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Minimal Supersymmetric Standard Model ◽  
Discrete Symmetry ◽  
Gauge Model ◽  
Supersymmetric Version ◽  
R Symmetry

We build the complete supersymmetric version of a 3-4-1 gauge model using the superfield formalism. We point out that a discrete symmetry, similar to the R-symmetry in the minimal supersymmetric standard model, is possible to be defined in this model. Hence we have both R-conserving and R-violating possibilities. We also discuss some phenomenological results coming from this model.

The nuclear magnetic field, Cabibbo angle, and CP violation in the nucleus

1977 ◽  
Vol 55 (6) ◽  
pp. 578-581 ◽  
Author(s):  
H. C. Lee ◽  
F. C. Khanna
Keyword(s):  
Magnetic Field ◽  
Cp Violation ◽  
Coupling Constants ◽  
Cabibbo Angle ◽  
The Magnetic Field ◽  
Nuclear Magnetic

The magnetic field in the nucleus is calculated microscopically. It is deduced that Salam and Strathdee's theory will unlikely provide an explanation for anomalies in the Fermi coupling constants in 35Arand 93Nb. CP violation in the β-decays of n and 19Neis not ruled out.

Weak radiative decays and CP violation in a Gauge model

1978 ◽  
Vol 47 (2) ◽  
pp. 251-277 ◽  
Author(s):  
M. A. Ahmed
Keyword(s):  
Cp Violation ◽  
Radiative Decays ◽  
Gauge Model
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